Gaya APA

Halperin, M, H, A. (2007). Power and Superpower: Global Leadership and Exceptionalism in the 21st Century . United States: the century foundation.New York.

Gaya MLA

Halperin, Morton, H...et., All.. "Power and Superpower: Global Leadership and Exceptionalism in the 21st Century". United States: the century foundation.New York, 2007. Text.